Coin signaling system
US4277647A · kind A · utility
7Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1979 |
| Grant date | Jul 7, 1981 |
| Priority date | — |
| Expiry date | Aug 31, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M17/023
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A subscriber loop carrier system is shown in which coin first and dial tone first pay stations can be serviced through the carrier system without modifying the central office. Coin supervisory states are detected at the central office terminal of the system, translated into unique cyclic codes for transmission through the system and detected at the remote terminal by reapplication of the coin supervisory states at the remote terminal. Coin first and dial tone first modes of operation are accommodated with simple option plugs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.